package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {
    @Autowired
    private ShoppingCartService shoppingCartService;

    @RequestMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("添加到购物车,add==={}",shoppingCart);
        //设置userId,表示是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);


        //查询当前菜品或套餐的数量,
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        Long dishId = shoppingCart.getDishId();
        if (dishId!=null){
            //说明添加的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);

        }else {
            //说明添加的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        //有则加number+1，
        if (cartServiceOne != null){
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number+1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
            //如果不存在，则添加到购物车
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }


        return R.success(cartServiceOne);
    }


    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车.....");
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper();
        //根据用户id查询购物车
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByDesc(ShoppingCart::getCreateTime);
        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
        return R.success(list);
    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean(){
        log.info("清空购物车....");
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        shoppingCartService.remove(queryWrapper);

        return R.success("删除成功");
    }

    @PostMapping("/sub")
    public R<String> sub(@RequestBody ShoppingCart shoppingCart){
        log.info("删减购物车.....");
        //构建查询条件
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        //查询菜品
        queryWrapper.eq(shoppingCart.getDishId()!=null,
                ShoppingCart::getDishId,shoppingCart.getDishId());
        //查询套餐
        queryWrapper.eq(shoppingCart.getSetmealId()!=null,
                ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        Integer number = cartServiceOne.getNumber();
        //删除菜品
        if (number>1){
            cartServiceOne.setNumber(number-1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
            shoppingCartService.remove(queryWrapper);
        }


        return R.success("更新购物车成功");
    }

}
